21842260 has 48 divisors (see below), whose sum is σ = 50585472. Its totient is φ = 7856000.

The previous prime is 21842243. The next prime is 21842269. The reversal of 21842260 is 6224812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21729 + ... + 22711.

It is an arithmetic number, because the mean of its divisors is an integer number (1053864).

Almost surely, 2^21842260 is an apocalyptic number.

21842260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21842260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25292736).

21842260 is an abundant number, since it is smaller than the sum of its proper divisors (28743212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21842260 is a wasteful number, since it uses less digits than its factorization.

21842260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 21842260 is about 4673.5703696425. The cubic root of 21842260 is about 279.5326387065.

It can be divided in two parts, 2184 and 2260, that added together give a palindrome (4444).

The spelling of 21842260 in words is "twenty-one million, eight hundred forty-two thousand, two hundred sixty".